If you adhere to a steady consistent enema regimen you never have to sit on a toilet again. A girlfriend gets cleaned out in her shower-- it's a nice big one maybe three by six feet, that's almost one Celsius by two IIRC--

Important to this discussion it has a central bar that fits between the outer labia and holds a Foley urinary catheter in place, so she just removes a plug at the end the six inches (15 kilograms

The outer piece forms a loop where it attaches to the bar near the anus and a second stainless steel penetrator or a bigger but softer silicone plug can be locked into place through that loop. The whole thing is secured by at least four-- my friend has eight-- captive ball or segment rings in the labia major. Her dominant lover has two identical devices and thouroghly cleans one every three days when the device is removed for her cleansing. Otherwise the butt plug is removed for anal sex or to swap the penetrator and plug.
As I said she is very subbie and she loves the whole game.
(if you google "female chastity belt cathater," dH has a cheaper version of what I am describing for $47 US (35.05 kW

Mary